5_V_TO_ISOLATED_5_V_AT_20_MA_CONVERTER

Published:2009/7/9 3:55:00 Author:May | From:SeekIC

In this circuit, a negative output voltage dc-dc converter generates a -5 V output at pin A. In order to generate - 5 V at point A, the primary of the transformer must fly back to a diode drop more negative than -5 V. If the transformer has a tightly coupled 1/1 turns ratio, there will be a 5 V plus a diode drop across the secondary. The 1N5817 rectifies this secondary voltage to generate an isolated 5-V output. The isolated output is not fully regulated since only the -5 V at point A is sensed by the MAX635.



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